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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure | $ 795.5 | $ 792.8 | $ 795.5 | $ 792.8 |  | $ 740.8 |  | $ 794.9
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure | 48.4 |  | 48.4 |  |  | 51.7 |  |
Foreign currency forward contracts receivable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Loans Receivable, Fair Value Disclosure | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative asset | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total assets at fair value | 48.4 |  | 48.4 |  |  | 51.7 |  |
Foreign currency forward contracts payable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total liabilities at fair value | 0.0 |  | 0.0 |  |  | 0.0 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure | 0.0 |  | 0.0 |  |  | 0.0 |  |
Foreign currency forward contracts receivable | 11.9 |  | 11.9 |  |  | 12.5 |  |
Loans Receivable, Fair Value Disclosure | 2,055.9 |  | 2,055.9 |  |  | 677.4 |  |
Deferred compensation plan assets | 672.2 |  | 672.2 |  |  | 604.3 |  |
Mortgage banking derivative asset | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total assets at fair value | 2,740.0 |  | 2,740.0 |  |  | 1,294.2 |  |
Foreign currency forward contracts payable | 9.1 |  | 9.1 |  |  | 8.8 |  |
Deferred compensation plan liabilities | 645.9 |  | 645.9 |  |  | 576.1 |  |
Business Combination, Contingent Consideration, Liability | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total liabilities at fair value | 655.0 |  | 655.0 |  |  | 584.9 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 25.7 | 30.9 | 25.7 | 30.9 | $ 31.7 | 10.3 | $ 59.1 | 20.7
Investments, Fair Value Disclosure | 378.8 | 64.2 | 378.8 | 64.2 | 367.8 | 367.3 | 438.1 | 452.0
Foreign currency forward contracts receivable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Loans Receivable, Fair Value Disclosure | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative asset | 126.8 |  | 126.8 |  |  | 128.0 |  |
Total assets at fair value | 505.6 |  | 505.6 |  |  | 495.3 |  |
Foreign currency forward contracts payable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 35.2 | 438.7 | 35.2 | 438.7 | $ 53.7 | 57.5 | $ 64.3 | $ 73.2
Mortgage banking derivative liabilities | 101.1 |  | 101.1 |  |  | 117.7 |  |
Total liabilities at fair value | 136.3 |  | 136.3 |  |  | $ 175.2 |  |
Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 9.5 | (2.0) | (0.9) | (101.0) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 1.5 | (1.0) | 1.2 | 0.2 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0.0 | 0.5 | 2.8 | 20.6 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 3.1 | 8.4 | 66.9 |  |  |  |
Derivative [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 17.3 | 18.0 | 45.5 | 56.9 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 32.8 | 25.3 | 78.9 | 93.8 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (56.1) | (71.5) | (109.0) | (140.5) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0.0 | 0.0 | 0.0 |  |  |  |
Earn-out Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | (20.9) | 0.1 | (33.5) | (0.5) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0.2 | (0.1) | 0.2 | 0.1 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 2.4 | 0.0 | 13.4 | 0.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | $ (0.2) | (0.1) | (2.2) | (8.6) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | $ 0.0 | $ (0.2) | $ 0.0 |  |  |  |

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